Park Tool BBT 29 Bottom Bracket Tool 9000 XTR. So...you're a high end Shimano guy, eh We don't blame you we love the Dura Ace and XTR performance too. So now you can get in and out of that bottom bracket with the Park Bottom Bracket Tool 9000 XTR, a double ended bottom bracket wrench designed to fit 16 notch bearing cups with an outside diameter of 39mm.